Polarimetric hyperspectral imager

Abstract

A hyperspectral sensor or imager comprising a laser for illuminating a scene and a detector for detecting light emitted by the laser and transmitted through the scene, wherein the laser is a chirped laser arranged to output multiple pulses having different wavelength ranges, the multiple pulses being used to form an extended continuous spectrum for illuminating the scene.

Description

technical field [0001] The invention relates to a spectral polarization hyperspectral imager. Specifically, the present invention relates to a hyperspectral imager using quantum cascade lasers. Background technique [0002] Hyperspectral imaging is a type of scene imaging over multiple discrete adjacent spectral bands. There are two basic types of hyperspectral imagers: as figure 1 As shown in (a), a wavelength scanning system that measures image segments according to a fixed wavelength, and as figure 1 A slit or line-scanning system that measures spectral fragments at fixed positions, either by rotating the spectral scan of the diffractive optical element, or by moving the position of the line through the slit spatial scan, as shown in (b). The data set required by such an imager is often referred to as a data cube, wherein the image of the scene region as spatial information gives a first two-dimensionality and the spectral information gives a third dimension. [0003]...

AI Technical Summary

Problems solved by technology

Working in LWIR has significant disadvantages since the background scene stores energy from a blackbody source (such as the sun) and releases it via radiation at wavelengths corresponding to the LWIR band

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